are for playing DVDs in a certain region of the world. The US is region 1. Unless you plan to take the player out of the US, or try to play DVDs created in, say, Russia, don't worry about it. Hacking the codes involves changing the region code. Some players can be "hacked" to change the codes. And unless you really know what you're doing, and how to access the firmware of the player, you can render the player unusable.
Don't wast your money on upconverters. You'll not see a difference. Trust me.
Wrinkles only go where smiles have been - JB
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Can someone explain what is meant by "regional dvd" and "codes to hack and unlock"...what does this mean? Also, please answer this, I am going to buy an hd tv and presently have an older sony dvd player. It has component out, which gives me a good picture on my present tv, which is a standard sony 27". Will this player look worse on any new HD tv (probably plasma) and how much better will one of these new upconverting DVD players be? Will the picture from one of those be better on an hdtv than the picture I am looking at now from my standard DVD into my standard 27" sony tv?